P. Finetti, E. Allaria, B. Diviacco, C. Callegari, B. Mahieu, J. Viefhaus, M. Zangrando, G. De Ninno, G. Lambert, E. Ferrari, J. Buck, M. Ilchen, B. Vodungbo, N. Mahne, C. Svetina, C. Spezzani, S. Di Mitri, G. Penco, M. Trovò, W. Fawley, P. Rebernik, D. Gauthier, C. Grazioli, M. Coreno, B. Ressel, A. Kivimäki, T. Mazza, L. Glaser, F. Scholz, J. Seltmann, P. Gessler, J. Grünert, A. De Fanis, M. Meyer, A. Knie, S. Moeller, L. Raimondi, F. Capotondi, E. Pedersoli, O. Plekan, M. Danailov, A. Demidovich, I. Nikolov, A. Abrami, J. Gautier, J. Lüning, P. Zeitoun, L. Giannessi
FERMI, based at Elettra (Trieste, Italy) is the first free electron laser (FEL) facility operated for user experiments in
seeded mode. Another unique property of FERMI, among other FEL sources, is to allow control of the polarization state
of the radiation. Polarization dependence in the study of the interaction of coherent, high field, short-pulse ionizing
radiation with matter, is a new frontier with potential in a wide range of research areas. The first measurement of the
polarization-state of VUV light from a single-pass FEL was performed at FERMI FEL-1 operated in the 52 nm-26 nm
range. Three different experimental techniques were used. The experiments were carried out at the end-station of two
different beamlines to assess the impact of transport optics and provide polarization data for the end user. In this paper
we summarize the results obtained from different setups. The results are consistent with each other and allow a general
discussion about the viability of permanent diagnostics aimed at monitoring the polarization of FEL pulses.
F. Frassetto, P. Miotti, C. Callegari, M. de Simone, P. Finetti, E. Giangrisostomi, C. Grazioli, F. Iesari, A. Kivimäki, R. Mincigrucci, E. Principi, S. Stagira, A. Di Cicco, M. Coreno, L. Poletto
We present the design and characterization of a compact and portable spectrometer realized for photon in-photon out
experiments (in particular X-Ray Emission Spectroscopy, XES), in particular tailored to be used at the FERMI freeelectron-
laser (FEL) at ELETTRA (Italy). The spectrometer can be installed on different end stations at variable
distances from the target area both at synchrotron and FEL beamlines. Different input sections can be accommodated in
order to fit the experimental requests, with/without an entrance slit and with/without an additional relay mirror. The
design is compact in order to realize a portable instrument within a total footprint of less than one square meter. The
instrument is based on the use of two flat-field grazing-incidence gratings and an EUV-enhanced CCD detector to cover
the 25-800 eV spectral range, with spectral resolution better than 0.2%. The absolute response of the spectrometer, has
been measured in the whole spectral region of operation, allowing calibrated measurements of the photon flux. The
characterization on the Gas Phase beamline at ELETTRA Synchrotron as instrument for XES and some experimental
data of the FEL emission taken at EIS-TIMEX beamline at FERMI, where the instrument has been used for photon beam
diagnostics, are presented.
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